//
// Created by zhangrongxiang on 2017/10/12 16:03
// File client
//

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <unistd.h>

#define BUFSIZE 1024

int main(int argc, char *argv[]) {
    int client_sockfd;
    int len;
    struct sockaddr_in remote_addr; //服务器端网络地址结构体
    int sin_size;
    char buf[BUFSIZE];  //数据传送的缓冲区
    memset(&remote_addr, 0, sizeof(remote_addr)); //数据初始化--清零
    remote_addr.sin_family = AF_INET; //设置为IP通信
    remote_addr.sin_addr.s_addr = inet_addr("127.0.0.1");//服务器IP地址
    remote_addr.sin_port = htons(8000); //服务器端口号

    /*创建客户端套接字--IPv4协议，面向无连接通信，UDP协议*/
    if ((client_sockfd = socket(PF_INET, SOCK_DGRAM, 0)) < 0) {
        perror("socket");
        return 1;
    }
    strcpy(buf, "This is a test message");
    printf("sending: '%s'\n", buf);
    sin_size = sizeof(struct sockaddr_in);

    /*向服务器发送数据包*/
    if ((len = sendto(client_sockfd, buf, strlen(buf), 0,
                      (struct sockaddr *) &remote_addr, sizeof(struct sockaddr))) < 0) {
        perror("recvfrom");
        return 1;
    }
    close(client_sockfd);
    return 0;
}